I think you push this button that says, "copy."

Patron Couple: Can you please show us how to use the copier?
Librarian: Sure. Let me just finish checking these people out.

5 minutes later, the librarian looks up and the couple is gone. They must have gotten tired of waiting.

5 minutes later, and they roll back in the door with a copy machine. They didn't want to use our copier, they wanted us to show them how to use theirs, so they brought it into the library, because, hey, why not?